Abstract
Nickel selenide thin films were synthesized on the amorphous templates utilizing a dip method. In the synthesis process, ascorbic acid acts as complexing agent. Hydrazine hydrate too plays a role of complexing agent and/or catalyst. Structural, optical, microscopic, electrical and thermoelectrical parameters were estimated. The X-ray diffraction spectrum of nickel selenide shows polycrystalline nature having hexagonal structure. The absorptivity of nickel selenide films is highly absorptive with a direct type of transition. The optical gap of NiSe was found to be 2.18 eV. The Urbach energy was found to be 0.275 eV. The ratio of Ni: Se in the thin film was 1:1. Micrograph of nickel selenide thin film showing irregular shaped fine grains distributed to the whole surface. The electrical conductance of nickel selenide suggests that the activation energy was found to be 0.024 and 0.331 eV for lower and higher temperature areas, respectively. At 300 K, the carrier concentration is estimated to be 2.58 × 1019 and 3.55 × 1019 at 525 K.
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The authors would like to thank to the University of Mumbai, Mumbai, for financial support for this project (Research Project No. 62 of 2012-13).
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Chate, P.A., Sathe, D.J. & Hake, S.L. Nickel selenide thin films: opto-electric and thermoelectric properties. Appl. Phys. A 128, 904 (2022). https://doi.org/10.1007/s00339-022-06064-0
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DOI: https://doi.org/10.1007/s00339-022-06064-0